Strict control of auricin production in Streptomyces aureofaciens CCM 3239 involves a feedback mechanism.

The polyketide gene cluster aur1 is responsible for the production of the angucycline antibiotic auricin in Streptomyces aureofaciens CCM 3239. Auricin production is regulated in a complex manner involving several regulators, including a key pathway-specific positive regulator Aur1P that belongs to the family of 'atypical' response regulators. Production of auricin is induced after entry into stationary phase.

Genetic manipulation of pathway regulation for overproduction of angucycline-like antibiotic auricin in Streptomyces aureofaciens CCM 3239.

The polyketide gene cluster aur1 is responsible for the production of the antibiotic auricin in Streptomyces aureofaciens CCM 3239. Auricin production is low and strictly regulated by two regulators, Aur1P and Aur1R. To improve auricin yield, we genetically manipulated S.

The role of two SARP family transcriptional regulators in regulation of the auricin gene cluster in Streptomyces aureofaciens CCM 3239.

Two regulators, Aur1P and Aur1R, have been previously found to control expression of the aur1 polyketide gene cluster involved in biosynthesis of the angucycline-like antibiotic auricin in Streptomyces aureofaciens CCM 3239 in a cascade mechanism. Here, we describe the characterization of two additional regulatory genes, aur1PR2 and aur1PR3, encoding homologues of the SARP family of transcriptional activators that were identified in the upstream part of the aur1 cluster. Expression of both genes is directed by a single promoter, aur1PR2p and aur1Pr3p, respectively, induced in late exponential phase.

The role of the TetR-family transcriptional regulator Aur1R in negative regulation of the auricin gene cluster in Streptomyces aureofaciens CCM 3239.

Two regulatory genes, aur1P and aur1R, have been previously identified upstream of the aur1 polyketide gene cluster involved in biosynthesis of the angucycline-like antibiotic auricin in Streptomyces aureofaciens CCM 3239. The aur1P gene encodes a protein similar to the response regulators of bacterial two-component signal transduction systems and has been shown to specifically activate expression of the auricin biosynthetic genes. The aur1R gene encodes a protein homologous to transcriptional repressors of the TetR family.